Unit Tests: Use Synth than SynthScope in typescript test

[tolluset]

Description

In docs recommend the test by using SynthScopre. But, it's hard to recognize the intent. Because SynthScope got a parameter of Constructs, I think this Is not natural. Most users watch this doc to learn unit tests of CDKTF, at that time they want to test their Stack, not the Constructs

Maybe docs showing using test by Synth, it can be more kindness for beginner.

ref:

Unit testing - toHaveResource() - found no resources instead
#1506

Unit testing failing to find resources for azurerm provider
#1850

Links

https://developer.hashicorp.com/terraform/cdktf/test/unit-tests#write-assertions

Help Wanted

• I'm interested in contributing a fix myself

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[tolluset]

I made PR #2756. For those who got in trouble on that page like me. 😿

[github-actions]

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